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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c80fc741d2ce4b4b8422f6d5f80a695147855b9ddce7e80bcd8cbd3f63665d' 
  AND token = '9/A42oqbWaGAl15aHHAetGFWeClsH/WVcrHc45/qwfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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