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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a5dd31a4a1adeaa1d58d9740e46571804575ab128ef6d19c8f5a2375c0f0b1' 
  AND token = '3hryA75xKhBhRtwYUOalDKt05hPwCh8GX40kT8YhNDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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