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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de22eba9c7c90bb09271910a06a182d0e9ebccf251711d75ad7cf052e49a472' 
  AND token = 'fmpGJe43yz4dGQcCq+DLn31ZNBlXooPq1g6EznoXE3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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