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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003b6ade1fa0500942b8b41ff1e908f9ec86a85b0f8d928c62b2cfe623e77d42' 
  AND token = '0C48c4JlMeYLvJiCEGyKUAZYeNxMZgDa0FbzihHCBj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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