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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6fa8b5547d516d24c16e1a54e222deafaf011ba797cc558f5234af5c524c63' 
  AND token = 'BQDm3Dq/O4V2pFmzFLoKf0h36I4RRT65MFjJmvo5d60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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