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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e085ba5fcaff18efbd3ca939a9d2e34c2f5b7fd57e025a04d2a57bf0c84c0e25' 
  AND token = 'A4RFpI3N9CO9ogvtYIW08AjLpbmHuayjtRoOY8BVQNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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