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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ae5e44393cf3c7d6397283c7040751ee2c742e3ba9470902b52f0340405880' 
  AND token = 'e75jijHf70E1npT6IAOO6GFQ1RobF43J0pi8Cr0ulhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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