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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13510accd1e64d390b3d5bbf5a45396613833bda18cd12555c8e9984e0b4410d' 
  AND token = 'U1Xnl0JZiVPjbHYnodG1uCKoPNe/7/QxQrCFbAxeUbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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