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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b51b4b94dafd5c858499a37192c25d82e33662e0b6f894bf2dce4d2604a850b' 
  AND token = 'YBNvyRG4DaoP9GaJyD3CNEmNxE5FssouocmTLz2KOzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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