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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ab5ca920080327d1b8b8593de3dc4e74b1235dc1bf5bb2200eb7a7f88a8fd0' 
  AND token = 'Nv6Ld/ZWrK440O4ZxHnQ+TEOo/EwCii6oxKdtQTZQnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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