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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46cc39207b88a3b469db5e0d395f8d29977fbcd4d3a324410ce12060d9819944' 
  AND token = 'EHeUnUr5LhAqEMHr62ioLRqEKbZ4iTIJ2Be/185Hl04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}