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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde9d397338c1bef73813b584cc30ef8a16572cc34d74e00ee4f9ca1aab010c3' 
  AND token = '9vfSIe8sodCCz7ZWoULMmF5uSmpbmyScSUP2ZkEA7pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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