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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61254fbe396de73b12a035c8506fa5ea4afe2615b895840413a2c72d16bd9c7a' 
  AND token = 'iZo4jMSKCRBqTMVd7A7KYSTK8M9zn1Muk38XyjSMY+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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