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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b64bd3196f7aa9c1c70647a147b95198e0cb923146922323c3a66a8f2559fd' 
  AND token = '8fMFL7lVhJrhwF5acMY34g8aASbzeBmcwhSkUeO5S5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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