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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55924f57c28689f5037b089a6e7ceb7f4c47f6a08ac8c2da906c56c244ac9bd3' 
  AND token = 'fUPrNC4uuS3k4T1l19hAKoRhuZRevnrUbXfa32o6S1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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