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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ffe0a154d8ab2ed362a8ea99ec141e815f51c8e06e82034596a0706dc685f7' 
  AND token = 'jcDYm9wIIst0ZEeu4EHCZI3Og8yTeOGpLaa3FlFBAlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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