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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1bac26bd7ab31b3a45f7531b6afd461a01572ac95fb80fd84be99ef27fdbc4' 
  AND token = 'Zow26iwaBZ2dIaML0CuLLz3Wal1rpqIgjyfs9hGAsBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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