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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd25398867d57cbf7a028de6efbee52be86d15b1539d05c15a2f4afd1fb31b0' 
  AND token = 'ueurLV8irFzbDIWOa84RuynV4mBLiuZLjaH2FZtO6q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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