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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394fba4ea2a0009e49c50805c1cbcf7b059274cfb0215223b1e401a9b2893d24' 
  AND token = 'kfKWY9M+YKTXLnMBkbyosq5OKbEkYKStlQhcJgcNzAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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