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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307178c628b54eb18a1e4bf000bef638792b1b990fb6683df8943c5a54638007' 
  AND token = 'jK4L6kID7I2DsrvwWIY9hoDChy/2aJLWrSJADPk7dmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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