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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31905a069976e856cf58ea357152c4446f7d2f4c5659bce8a24c477361054176' 
  AND token = 'bYt3aeEkj6HWcBdGuhLxln+sVcbQutMieVRkk2ummso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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