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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1310d97f206052e03cdc3dd3a57b5a10a1fd121a420ee026d82c09b1fed0c8b' 
  AND token = '8vrDxE7MoJgckg/FjRxxI7/I+9ZKksO8E/i9mZSN1lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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