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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bc00cdab9d82261126fb24b94e47e1cce320c4b1ae52ccaa0f2e459537557a' 
  AND token = 'XR325/daLKOWPmEWDHb+8HvwM7xlEVkO2FX+i/oGCdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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