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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136a6f4c30c8d71f2e1a951c9248a986ef41a3b900b7bfbf3b1753c5272938e6' 
  AND token = 'S9zq3Gk0gmfdtuQic06Lp6FsKFmiXfrD0AQ56YJuY8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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