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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e799a13a58d1e45c78f40d9a24e885ac95112c77c9c0b9667048edf5ca7900a' 
  AND token = 'lyFBzefcs+Ac1lbLxExw1McfHJCfkMIA8m2YyK5/hNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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