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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb10029654fd84dad338f157e3bc36f20e42527d6951f266c87f6fa3c418c38' 
  AND token = 'CQi+HKCLlAamdXMH9z2bTkYf1TUeOTmwML5cgd/Wiq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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