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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ae7429d24f26571149b0e57666e6f10ce0b8fcd38348f17c2fa8a9b10e576b' 
  AND token = 'L+hVuTfq6pWebeHZy9Pl9n8ul1VjLK1ZdwIe44j6AGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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