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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f53f81d5a3a065fdbebc8089ba0144e83e3e3733a18542b6ea78471a2bc2fb5' 
  AND token = '7PbkF/r6JFajCSa29IsPlhtBLuEHcWTZG3e19Rp9i0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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