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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6da56a8773f9aea0e1708eeea51db40e57658f524d0ef2d988d9c9c821e64f5' 
  AND token = 'jZHP/J6Uo4Bx/ZM7nz26zXXgu1hu3b1ir4p2/qvc1TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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