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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2c752f0ec1e94593eba64aa63a312a5ecf922220315203d8587f0f4181f42f' 
  AND token = 'YnJfTO1ykLTCi+SfYiLpnvkDhXZDYFZWOdSd59q65Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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