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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e472883e203065d76ecf8044b61e9ea692727c1fa16f467fc94aa52c68e1d5' 
  AND token = 'froiJQ69MH/IX4pCL5vzOvdd+9Ln+koYHpV/I0KYdz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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