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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c9e6c4da5e1db4f71ab72697ce19a2eeacfaddd0dacc30aeb7c035d9858cc5' 
  AND token = '2dwxgCpvRDmVJZvTc+BFfiK9Pq+avR5Ab0f06hWShvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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