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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8355db8fd6dc5b353635e1ef18e8fb5a9000edaea635f715c1fa5addfc7796f' 
  AND token = 'eblYjW10kZUwlQ4cI+ir9NofCxz2Bzqs+vCrbHw7rXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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