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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7092a6f0560302a72cce188dc329df7b4fe67fd0ee215b6e6b134b0f6e0fc79f' 
  AND token = 'LGbV56Fj71cwGKtPZKu2AaJeePyg6Nm72XvX2wqbr74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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