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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82f44e1d80a970f42a7eab65244ea0fdda7cc9e44f8c1528d1927f021ea46de' 
  AND token = 'Xog+AsltkAwFToDgSTBlFyJdW1P1+YCGFKci9vVT36I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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