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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670b96bad76ab8e68803b0b8c284d5fabf738520e739c09948ba1de635efd163' 
  AND token = 'WQVyY7XTbNrptut2zDa7d02RIu8GgKk2u9QC8cyUnTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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