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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50dbd9f1498a3b0a63a24e5c4a81731d5ce01024d58dfe14a195cd57a6e1dc87' 
  AND token = 'RqKg34UZvtbZuzriGH1cjMHzW7KaTXgmTLV30xa9vaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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