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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bfff4d2d6958b837e293a7b7e41712e9d4c360830cba77e6f9af38d8fef10e' 
  AND token = 'CQ56cMTd3y1cAhsi7b873eIme61b7fYqWTOOZSUQv+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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