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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98a87536fe3f24b02235d0fad59ee83326eeeaec569ca92fa48e4369616f674' 
  AND token = 'HTA7Wd+CkJrkwa3iNhxL6IGhmi0B0d1c7EtoIAus+SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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