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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1626487ac682e863ae43bae2d3192c13fe41f93b7ff667bfd293ee33f2530cba' 
  AND token = 'ozA3AZM5yzX1///vTf33Q7mfif9JFF75BxSCArOdzFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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