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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5795ab8027b114bf1ddcf42ad1d47c385c99003a45d143024ca9b3d294f1465' 
  AND token = '59WudIJp5fGIcgu/Uw9Y/sE90qpZtHKhebhL/5h0/jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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