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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c76c42cb825366d7e0d424bf2972942b8098a8f31cfea006281c446d45bc4b' 
  AND token = 'q6O0adFtERYoDzXBS1lwPQGf8URWCjw1r3hqY+0c/3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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