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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7960e1d48a095ad3a8ae73a82d9b0631285a1fdb4030c016c21480c2cbc4cf' 
  AND token = 'H8xHvGeUAHlkmw77AkMxXtQ58zzjZXhhh0ziuwn0nRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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