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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d1be88472515d7463c1b69fcd74f0348424f7a8febe775be19c9b1ce2c965b' 
  AND token = '7jo227OohLcdRHGSSoL8O1TulAXNmFFmXJDWBavj4J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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