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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8305ffa1899fa3ea6a9a03956c31814b4fa3bb61d16783f2a633089685732940' 
  AND token = '5pIAt2J5BDmUEJKVf5NMSPNtRvziN7T/hkfh4PGvKpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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