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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68988b6745d54be772f67b452d6bfa15d8f71d1a187d313ca292cddbdcbe3441' 
  AND token = 'vQSRnT0acTsyMBUc4hSQVSWpbyPzTHuLdo1L+9jxLsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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