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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bab9038a74a05a8c22f021da50ea2999a11c306b6b0afa0627e5a4dc7204ae' 
  AND token = '5bYDd7DaetGf/YCeQB3rt4GDdMl+FHKkpA+NGAhhu/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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