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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdbb7d87bc1d6d4acec2de9cdd9779f5a00280f34ec35d9b212bdac77357068' 
  AND token = 'fZGbY7MaVYPA6VoHfTu0ntJg7XrqfgIr38LhMztr+uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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