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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea68e7357dc751e10b6368cc3bed8788da13709d33bf88d7b9a94e7b8c661ca' 
  AND token = 'rv0yrwK5dBOkpgnAegBgiJN6gJ3tQ8Gr46ST3gCasvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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