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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a655bbb3426bcb7d45a72f1d0b9cecae57de44e027e02bd27f6bf646256cf9' 
  AND token = 'zWMgTwD6o2BJtkDiYD2Rted1ln/4M6qhbEJPi/sRhU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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