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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d93ee9dc15176cc9438afaa2b9c8ab4087440f5445b8720a53defec28e714c' 
  AND token = 'no7ZOdlDc2G16y3mxmXPWlGjIcCxInTqmYv86fBloLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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