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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1bdeeef24ee933b0ac45d63bab0bf31656952d1cc61cb40d6b461918bf0dab' 
  AND token = 'I7Ao1nZ6x7ztpBikzYXzOzRPt8rv57dLBPoxwvVyWrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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