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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93c3aef919fe8a442066a3367e74d1469dedbf8a555e234fdac6203a0a5c971' 
  AND token = 'MwoBL1yWU/0uYjJ1KnERa9n3+zJfxEd0rmvPai8O8Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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