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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03603d03e79a39ad264404a48cf4d8a8a3f443b5f2ec633f051b751619070551' 
  AND token = 'URoCAdugMHq+LRzajPREzhc/+Z9F+kgwTWq2saFDdUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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