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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0785100dc1b056bd10b824df2cd854b6a4372df8bb08a675681cc3e71a04f04f' 
  AND token = 'J9HrD/jiEqrLff6cbnaPFHwEgv5ihwGUH96YU8nkPv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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